It won't let me log in!

When ever I try to log in to sl it will just say " Could not connect to the server. The certificate returned by the Grid appears to be expired Please check your system clock or contact Grid administrator

Subjest name: emailAddress=root@lindenlab."

Then it tells me to go on this website and the website did not help and then it just says things that arent words and a bunch of numbers !!! WHAT DO I DO????!!!!